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What is this Drug
Viagra (sil-DEN-a-fil) belongs to a group of medicines that delay the enzymes called phosphodiesterases from working too quickly. The penis is one of the areas where these enzymes work. Viagra is used
to treat men who have erectile dysfunction (also called sexual impotence).
By controlling the enzyme phosphodiesterase, Viagra helps to maintain an erection that is produced when the penis i
s stroked. Without physical action to the penis, such as that occurring during sexual intercourse, Viagra will not work to cause an erection
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How should this medicine be used?
Viagra comes as a tablet to take by mouth. It should be taken as needed about 1 hour before sexual activity. However, Viagra can be taken anytime from 4 hours to 30 minutes before sexual activity. Via
gra should not be taken more than once a day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Viagra exact
ly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
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What special precautions should I follow?
Viagra has not been studied with other medicines used for treatment of erectile dysfunction. Presently, using them together is not recommended .
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- Use Viagra exactly as directed by your doc
tor. Do not use more of it and do not use it more often than your doctor ordered. If too much is used, the chance of side effects is increased.
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If you experience a prolonged or painful erec
tion for 4 hours or more, contact your doctor immediately. This condition may require prompt medical treatment to prevent tissue damage of the penis and possible permanent impotence.
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Overdose
No overdose of Viagra has been reported. However, any medication taken in excess can have serious consequences. If you suspect an overdose, seek medical attention immediately.
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Before Taking This Medicine
Before taking Viagra,
tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially amlodipine (Norvasc) or other medications for high blood pre
ssure, cimetidine (Tagamet, Tagamet HB), erythromycin, HIV protease inhibitors such as ritonavir (Norvir) and saquinavir (Invirase), isosorbide (Imdur, Ismo, Isordil, and others), itraconazole (Sporan
ox), ketoconazole (Nizoral), nitroglycerin (Nitro-Bid, Nitrostat, and others), other medications to treat impotence, phenobarbital, rifampin (Rifadin, Rimactane),and vitamins.
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What side effects may occur?
Side effects cannot be anticipated. If any develop or change in intensity, inform your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking Viagra.
More common side effects may include:
Abnormal vision (color tinge, blurring, sensitivity to light), acid indigestion, diarrhea, flushing, headache, nasal congestion, urinary tract infection
Heart attack, stroke, heart irregularities, dangerous surges in blood pressure, and sudden death have all been reported after use of Viagra, usually in men with existing cardiac risk factors
, and typically during or shortly after sex.
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